Mode Category Description Default
MCU/R
CU
other
than
Hitachi
produc
t is
used
as an
extern
al
subsys
tem.
2. While USP
V/VM is
used as an
external
subsystem
and its
volume is
DP-VOL, if
some Pool-
VOLs
constitutin
g the DP-
VOL are
blocked, a
phenomen
on of
external
path
blockade
and
recovery
occurs
repeatedly.
3. In the case
that a
virtual
volume
mapped by
UVM is set
to pool-
VOL and
used as
DP-VOL in
local
subsystem,
this SOM
can be
applied
without
problem.
491
ShadowImage Mode 491 is used for improving the performance of
ShadowImage / ShadowImage FCv1.Mode ON: The option
(Reserve05) of ShadowImage is available. If the option is
set to ON, the copy of ShadowImage / ShadowImage
OFF .
System option modes
B-11
Hitachi Unified Storage VM Block Module Hardware User Guide
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